core: better side-chain importing
This commit is contained in:
Martin Holst Swende
Péter Szilágyi
parent
3d997b6dec
commit
493903eede
@ -1048,6 +1048,80 @@ func (bc *BlockChain) InsertChain(chain types.Blocks) (int, error) {
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return n, err
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}
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// addFutureBlock checks if the block is within the max allowed window to get accepted for future processing, and
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// returns an error if the block is too far ahead and was not added.
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func (bc *BlockChain) addFutureBlock(block *types.Block) error {
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max := big.NewInt(time.Now().Unix() + maxTimeFutureBlocks)
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if block.Time().Cmp(max) > 0 {
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return fmt.Errorf("future block: %v > %v", block.Time(), max)
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}
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bc.futureBlocks.Add(block.Hash(), block)
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return nil
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}
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// importBatch is a helper function to assist during chain import
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type importBatch struct {
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chain types.Blocks
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results <-chan error
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index int
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validator Validator
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}
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// newBatch creates a new batch based on the given blocks, which are assumed to be a contiguous chain
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func newBatch(chain types.Blocks, results <-chan error, validator Validator) *importBatch {
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return &importBatch{
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chain: chain,
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results: results,
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index: -1,
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validator: validator,
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}
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}
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// next returns the next block in the batch, along with any potential validation error for that block
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// When the end is reached, it will return (nil, nil), but Current() will always return the last element.
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func (batch *importBatch) next() (*types.Block, error) {
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if batch.index+1 >= len(batch.chain) {
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return nil, nil
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}
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batch.index++
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if err := <-batch.results; err != nil {
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return batch.chain[batch.index], err
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}
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return batch.chain[batch.index], batch.validator.ValidateBody(batch.chain[batch.index])
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}
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// current returns the current block that's being processed. Even after the next() has progressed the entire
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// chain, current will always return the last element
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func (batch *importBatch) current() *types.Block {
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if batch.index < 0 {
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return nil
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}
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return batch.chain[batch.index]
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}
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// previous returns the previous block was being processed, or nil
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func (batch *importBatch) previous() *types.Block {
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if batch.index < 1 {
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return nil
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}
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return batch.chain[batch.index-1]
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}
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// first returns the first block in the batch
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func (batch *importBatch) first() *types.Block {
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return batch.chain[0]
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}
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// remaining returns the number of remaining blocks
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func (batch *importBatch) remaining() int {
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return len(batch.chain) - batch.index
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}
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// processed returns the number of processed blocks
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func (batch *importBatch) processed() int {
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return batch.index + 1
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}
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// insertChain will execute the actual chain insertion and event aggregation. The
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// only reason this method exists as a separate one is to make locking cleaner
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// with deferred statements.
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@ -1067,12 +1141,27 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
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chain[i-1].Hash().Bytes()[:4], i, chain[i].NumberU64(), chain[i].Hash().Bytes()[:4], chain[i].ParentHash().Bytes()[:4])
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}
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}
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log.Info("insertChain", "from", chain[0].NumberU64(), "to", chain[len(chain)-1].NumberU64())
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// Pre-checks passed, start the full block imports
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bc.wg.Add(1)
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defer bc.wg.Done()
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bc.chainmu.Lock()
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defer bc.chainmu.Unlock()
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return bc.insertChainInternal(chain, true)
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}
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//insertChainInternal is the internal implementation of insertChain, which assumes that
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// 1. chains are contiguous, and
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// 2. The `chainMu` lock is held
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// This method is split out so that import batches that require re-injecting historical blocks can do
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// so without releasing the lock, which could lead to racey behaviour. If a sidechain import is in progress,
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// and the historic state is imported, but then new canon-head is added before the actual sidechain completes,
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// then the historic state could be pruned again
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func (bc *BlockChain) insertChainInternal(chain types.Blocks, verifySeals bool) (int, []interface{}, []*types.Log, error) {
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// Start a parallel signature recovery (signer will fluke on fork transition, minimal perf loss)
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senderCacher.recoverFromBlocks(types.MakeSigner(bc.chainConfig, chain[0].Number()), chain)
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// A queued approach to delivering events. This is generally
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// faster than direct delivery and requires much less mutex
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@ -1082,6 +1171,8 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
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events = make([]interface{}, 0, len(chain))
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lastCanon *types.Block
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coalescedLogs []*types.Log
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block *types.Block
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err error
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)
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// Start the parallel header verifier
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headers := make([]*types.Header, len(chain))
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@ -1089,16 +1180,57 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
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for i, block := range chain {
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headers[i] = block.Header()
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seals[i] = true
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seals[i] = verifySeals
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}
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abort, results := bc.engine.VerifyHeaders(bc, headers, seals)
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defer close(abort)
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// Start a parallel signature recovery (signer will fluke on fork transition, minimal perf loss)
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senderCacher.recoverFromBlocks(types.MakeSigner(bc.chainConfig, chain[0].Number()), chain)
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// Peek the error for the first block
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batch := newBatch(chain, results, bc.Validator())
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if block, err = batch.next(); err != nil {
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if err == consensus.ErrPrunedAncestor {
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return bc.insertSidechainInternal(batch, err)
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} else if err == consensus.ErrFutureBlock ||
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(err == consensus.ErrUnknownAncestor && bc.futureBlocks.Contains(batch.first().ParentHash())) {
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// Iterate over the blocks and insert when the verifier permits
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for i, block := range chain {
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// The first block is a future block
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// We can shove that one and any child blocks (that fail because of UnknownAncestor) into the future-queue
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for block != nil && (batch.index == 0 || err == consensus.ErrUnknownAncestor) {
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block := batch.current()
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if futureError := bc.addFutureBlock(block); futureError != nil {
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return batch.index, events, coalescedLogs, futureError
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}
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block, err = batch.next()
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}
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stats.queued += batch.processed()
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stats.ignored += batch.remaining()
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// If there are any still remaining, mark as ignored
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return batch.index, events, coalescedLogs, err
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} else if err == ErrKnownBlock {
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// Block and state both already known -- there can be two explanations.
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// 1. We did a roll-back, and should now do a re-import
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// 2. The block is stored as a sidechain, and is lying about it's stateroot, and passes a stateroot
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// from the canonical chain, which has not been verified.
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// Skip all known blocks that are blocks behind us
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currentNum := bc.CurrentBlock().NumberU64()
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for block != nil && err == ErrKnownBlock && currentNum >= block.NumberU64() {
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// We ignore these
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stats.ignored++
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block, err = batch.next()
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}
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// Falls through to the block import
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} else {
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// Some other error
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stats.ignored += len(batch.chain)
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bc.reportBlock(block, nil, err)
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return batch.index, events, coalescedLogs, err
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}
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}
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// No validation errors
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for ; block != nil && err == nil; block, err = batch.next() {
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// If the chain is terminating, stop processing blocks
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if atomic.LoadInt32(&bc.procInterrupt) == 1 {
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log.Debug("Premature abort during blocks processing")
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@ -1107,115 +1239,45 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
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// If the header is a banned one, straight out abort
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if BadHashes[block.Hash()] {
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bc.reportBlock(block, nil, ErrBlacklistedHash)
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return i, events, coalescedLogs, ErrBlacklistedHash
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return batch.index, events, coalescedLogs, ErrBlacklistedHash
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}
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// Wait for the block's verification to complete
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bstart := time.Now()
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err := <-results
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if err == nil {
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err = bc.Validator().ValidateBody(block)
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}
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switch {
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case err == ErrKnownBlock:
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// Block and state both already known. However if the current block is below
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// this number we did a rollback and we should reimport it nonetheless.
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if bc.CurrentBlock().NumberU64() >= block.NumberU64() {
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stats.ignored++
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continue
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}
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case err == consensus.ErrFutureBlock:
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// Allow up to MaxFuture second in the future blocks. If this limit is exceeded
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// the chain is discarded and processed at a later time if given.
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max := big.NewInt(time.Now().Unix() + maxTimeFutureBlocks)
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if block.Time().Cmp(max) > 0 {
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return i, events, coalescedLogs, fmt.Errorf("future block: %v > %v", block.Time(), max)
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}
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bc.futureBlocks.Add(block.Hash(), block)
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stats.queued++
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continue
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case err == consensus.ErrUnknownAncestor && bc.futureBlocks.Contains(block.ParentHash()):
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bc.futureBlocks.Add(block.Hash(), block)
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stats.queued++
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continue
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case err == consensus.ErrPrunedAncestor:
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// Block competing with the canonical chain, store in the db, but don't process
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// until the competitor TD goes above the canonical TD
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currentBlock := bc.CurrentBlock()
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localTd := bc.GetTd(currentBlock.Hash(), currentBlock.NumberU64())
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externTd := new(big.Int).Add(bc.GetTd(block.ParentHash(), block.NumberU64()-1), block.Difficulty())
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if localTd.Cmp(externTd) > 0 {
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if err = bc.WriteBlockWithoutState(block, externTd); err != nil {
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return i, events, coalescedLogs, err
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}
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continue
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}
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// Competitor chain beat canonical, gather all blocks from the common ancestor
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var winner []*types.Block
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parent := bc.GetBlock(block.ParentHash(), block.NumberU64()-1)
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for !bc.HasState(parent.Root()) {
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winner = append(winner, parent)
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parent = bc.GetBlock(parent.ParentHash(), parent.NumberU64()-1)
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}
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for j := 0; j < len(winner)/2; j++ {
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winner[j], winner[len(winner)-1-j] = winner[len(winner)-1-j], winner[j]
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}
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// Import all the pruned blocks to make the state available
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bc.chainmu.Unlock()
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_, evs, logs, err := bc.insertChain(winner)
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bc.chainmu.Lock()
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events, coalescedLogs = evs, logs
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if err != nil {
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return i, events, coalescedLogs, err
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}
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case err != nil:
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bc.reportBlock(block, nil, err)
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return i, events, coalescedLogs, err
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}
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// Create a new statedb using the parent block and report an
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// error if it fails.
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var parent *types.Block
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if i == 0 {
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parent = batch.previous()
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if parent == nil {
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parent = bc.GetBlock(block.ParentHash(), block.NumberU64()-1)
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} else {
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parent = chain[i-1]
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}
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state, err := state.New(parent.Root(), bc.stateCache)
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if err != nil {
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return i, events, coalescedLogs, err
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return batch.index, events, coalescedLogs, err
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}
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// Process block using the parent state as reference point.
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receipts, logs, usedGas, err := bc.processor.Process(block, state, bc.vmConfig)
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if err != nil {
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bc.reportBlock(block, receipts, err)
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return i, events, coalescedLogs, err
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return batch.index, events, coalescedLogs, err
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}
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// Validate the state using the default validator
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err = bc.Validator().ValidateState(block, parent, state, receipts, usedGas)
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if err != nil {
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if err := bc.Validator().ValidateState(block, parent, state, receipts, usedGas); err != nil {
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bc.reportBlock(block, receipts, err)
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return i, events, coalescedLogs, err
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return batch.index, events, coalescedLogs, err
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}
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proctime := time.Since(bstart)
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// Write the block to the chain and get the status.
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status, err := bc.WriteBlockWithState(block, receipts, state)
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if err != nil {
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return i, events, coalescedLogs, err
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return batch.index, events, coalescedLogs, err
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}
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switch status {
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case CanonStatTy:
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log.Debug("Inserted new block", "number", block.Number(), "hash", block.Hash(), "uncles", len(block.Uncles()),
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"txs", len(block.Transactions()), "gas", block.GasUsed(), "elapsed", common.PrettyDuration(time.Since(bstart)))
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log.Debug("Inserted new block", "number", block.Number(), "hash", block.Hash(),
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"uncles", len(block.Uncles()), "txs", len(block.Transactions()), "gas", block.GasUsed(),
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"elapsed", common.PrettyDuration(time.Since(bstart)),
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"root", block.Root().String())
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coalescedLogs = append(coalescedLogs, logs...)
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blockInsertTimer.UpdateSince(bstart)
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events = append(events, ChainEvent{block, block.Hash(), logs})
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lastCanon = block
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@ -1223,23 +1285,138 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
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bc.gcproc += proctime
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case SideStatTy:
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log.Debug("Inserted forked block", "number", block.Number(), "hash", block.Hash(), "diff", block.Difficulty(), "elapsed",
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common.PrettyDuration(time.Since(bstart)), "txs", len(block.Transactions()), "gas", block.GasUsed(), "uncles", len(block.Uncles()))
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blockInsertTimer.UpdateSince(bstart)
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log.Debug("Inserted forked block", "number", block.Number(), "hash", block.Hash(),
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"diff", block.Difficulty(), "elapsed", common.PrettyDuration(time.Since(bstart)),
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"txs", len(block.Transactions()), "gas", block.GasUsed(), "uncles", len(block.Uncles()),
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"root", block.Root().String())
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events = append(events, ChainSideEvent{block})
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}
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blockInsertTimer.UpdateSince(bstart)
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stats.processed++
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stats.usedGas += usedGas
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cache, _ := bc.stateCache.TrieDB().Size()
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stats.report(chain, i, cache)
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stats.report(chain, batch.index, cache)
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}
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// Any blocks remaining here? If so, the only ones we need to care about are
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// shoving future blocks into queue
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if block != nil && err == consensus.ErrFutureBlock {
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if futureErr := bc.addFutureBlock(block); futureErr != nil {
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return batch.index, events, coalescedLogs, futureErr
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}
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for block, err = batch.next(); block != nil && err == consensus.ErrUnknownAncestor; {
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if futureErr := bc.addFutureBlock(block); futureErr != nil {
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return batch.index, events, coalescedLogs, futureErr
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}
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stats.queued++
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block, err = batch.next()
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}
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}
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stats.ignored += batch.remaining()
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// Append a single chain head event if we've progressed the chain
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if lastCanon != nil && bc.CurrentBlock().Hash() == lastCanon.Hash() {
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events = append(events, ChainHeadEvent{lastCanon})
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}
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return 0, events, coalescedLogs, nil
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return 0, events, coalescedLogs, err
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}
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// insertSidechainInternal should be called when an import batch hits upon a pruned ancestor error, which happens when
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// an sidechain with a sufficiently old fork-block is found. It writes all (header-and-body-valid) blocks to disk, then
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// tries to switch over to the new chain if the TD exceeded the current chain.
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// It assumes that relevant locks are held already (hence 'Internal')
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func (bc *BlockChain) insertSidechainInternal(batch *importBatch, err error) (int, []interface{}, []*types.Log, error) {
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// If we're given a chain of blocks, and the first one is pruned, that means we're getting a
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// sidechain imported. On the sidechain, we validate headers, but do not validate body and state
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// (and actually import them) until the sidechain reaches a higher TD.
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// Until then, we store them in the database (assuming that the header PoW check works out)
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var (
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externTd *big.Int
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canonHeadNumber = bc.CurrentBlock().NumberU64()
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events = make([]interface{}, 0)
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coalescedLogs []*types.Log
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)
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// The first sidechain block error is already verified to be ErrPrunedAncestor. Since we don't import
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// them here, we expect ErrUnknownAncestor for the remaining ones. Any other errors means that
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// the block is invalid, and should not be written to disk.
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block := batch.current()
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for block != nil && (err == consensus.ErrPrunedAncestor) {
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// Check the canonical stateroot for that number
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if remoteNum := block.NumberU64(); canonHeadNumber >= remoteNum {
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canonBlock := bc.GetBlockByNumber(remoteNum)
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if canonBlock != nil && canonBlock.Root() == block.Root() {
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// This is most likely a shadow-state attack.
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// When a fork is imported into the database, and it eventually reaches a block height which is
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// not pruned, we just found that the state already exist! This means that the sidechain block
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// refers to a state which already exists in our canon chain.
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// If left unchecked, we would now proceed importing the blocks, without actually having verified
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// the state of the previous blocks.
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log.Warn("Sidechain ghost-state attack detected", "blocknum", block.NumberU64(),
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"sidechain root", block.Root(), "canon root", canonBlock.Root())
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// If someone legitimately side-mines blocks, they would still be imported as usual. However,
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// we cannot risk writing unverified blocks to disk when they obviously target the pruning
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// mechanism.
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return batch.index, events, coalescedLogs, fmt.Errorf("sidechain ghost-state attack detected")
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}
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}
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if externTd == nil {
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externTd = bc.GetTd(block.ParentHash(), block.NumberU64()-1)
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}
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externTd = new(big.Int).Add(externTd, block.Difficulty())
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if !bc.HasBlock(block.Hash(), block.NumberU64()) {
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if err := bc.WriteBlockWithoutState(block, externTd); err != nil {
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return batch.index, events, coalescedLogs, err
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}
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}
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block, err = batch.next()
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}
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// At this point, we've written all sidechain blocks to database. Loop ended either on some other error,
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// or all were processed. If there was some other error, we can ignore the rest of those blocks.
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//
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// If the externTd was larger than our local TD, we now need to reimport the previous
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// blocks to regenerate the required state
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currentBlock := bc.CurrentBlock()
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localTd := bc.GetTd(currentBlock.Hash(), currentBlock.NumberU64())
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// don't process until the competitor TD goes above the canonical TD
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if localTd.Cmp(externTd) > 0 {
|
||||
// If we have hit a sidechain, we may have to reimport pruned blocks
|
||||
log.Info("Sidechain stored", "start", batch.first().NumberU64(), "end", batch.current().NumberU64(), "sidechain TD", externTd, "local TD", localTd)
|
||||
return batch.index, events, coalescedLogs, err
|
||||
}
|
||||
// Competitor chain beat canonical. Before we reprocess to get the common ancestor, investigate if
|
||||
// any blocks in the chain are 'known bad' blocks.
|
||||
for index, b := range batch.chain {
|
||||
if bc.badBlocks.Contains(b.Hash()) {
|
||||
log.Info("Sidechain import aborted, bad block found", "index", index, "hash", b.Hash())
|
||||
return index, events, coalescedLogs, fmt.Errorf("known bad block %d 0x%x", b.NumberU64(), b.Hash())
|
||||
}
|
||||
}
|
||||
// gather all blocks from the common ancestor
|
||||
var parents []*types.Block
|
||||
// Import all the pruned blocks to make the state available
|
||||
parent := bc.GetBlock(batch.first().ParentHash(), batch.first().NumberU64()-1)
|
||||
for !bc.HasState(parent.Root()) {
|
||||
if bc.badBlocks.Contains(parent.Hash()) {
|
||||
log.Info("Sidechain parent processing aborted, bad block found", "number", parent.NumberU64(), "hash", parent.Hash())
|
||||
return 0, events, coalescedLogs, fmt.Errorf("known bad block %d 0x%x", parent.NumberU64(), parent.Hash())
|
||||
}
|
||||
parents = append(parents, parent)
|
||||
parent = bc.GetBlock(parent.ParentHash(), parent.NumberU64()-1)
|
||||
}
|
||||
for j := 0; j < len(parents)/2; j++ {
|
||||
parents[j], parents[len(parents)-1-j] = parents[len(parents)-1-j], parents[j]
|
||||
}
|
||||
// Import all the pruned blocks to make the state available
|
||||
// During re-import, we can disable PoW-verification, since these are already verified
|
||||
log.Info("Inserting parent blocks for reprocessing", "first", parents[0].NumberU64(), "count", len(parents), "last", parents[len(parents)-1].NumberU64)
|
||||
_, evs, logs, err := bc.insertChainInternal(parents, false)
|
||||
events, coalescedLogs = evs, logs
|
||||
if err != nil {
|
||||
return 0, events, coalescedLogs, err
|
||||
}
|
||||
log.Info("Inserting sidechain blocks for processing")
|
||||
errindex, events, coalescedLogs, err := bc.insertChainInternal(batch.chain[0:batch.index], false)
|
||||
return errindex, events, coalescedLogs, err
|
||||
}
|
||||
|
||||
// insertStats tracks and reports on block insertion.
|
||||
|
||||
@ -287,7 +287,7 @@ func (n *Node) startInProc(apis []rpc.API) error {
|
||||
if err := handler.RegisterName(api.Namespace, api.Service); err != nil {
|
||||
return err
|
||||
}
|
||||
n.log.Debug("InProc registered", "service", api.Service, "namespace", api.Namespace)
|
||||
n.log.Debug("InProc registered", "namespace", api.Namespace)
|
||||
}
|
||||
n.inprocHandler = handler
|
||||
return nil
|
||||
|
||||
@ -434,7 +434,7 @@ func (tab *Table) loadSeedNodes() {
|
||||
for i := range seeds {
|
||||
seed := seeds[i]
|
||||
age := log.Lazy{Fn: func() interface{} { return time.Since(tab.db.LastPongReceived(seed.ID())) }}
|
||||
log.Debug("Found seed node in database", "id", seed.ID(), "addr", seed.addr(), "age", age)
|
||||
log.Trace("Found seed node in database", "id", seed.ID(), "addr", seed.addr(), "age", age)
|
||||
tab.add(seed)
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user